Mary-Mary

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Hello,

Does anyone know how many books are in the Mary-Mary series by Joan G. Robinson, please? We have the new edition which includes 'mary-Mary' and 'More Mary-Mary' but the web continually refers to a series (suggesting more than a book and sequel) and several searches have failed to produce an actual list of the books. I have seen another book called 'Madam Mary-Mary' but can't work out whether this is the sequel printed under a different name. Thank you!